Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <20181127062503.GH6163@shao2-debian> <CAHk-=wiq9eTzenOPh9srdB=Y8NcP6NJxh7o8Y5SfSjfqZ20-RA@mail.gmail.com>
 <20181127205737.GI16136@redhat.com> <87tvk1yjkp.fsf@yhuang-dev.intel.com>
 <CAHk-=wjgRO-=NPaU9EmrdC3it3o7kvf4u7sewv3crtNLkE13Hg@mail.gmail.com>
 <CAHk-=wjgpWOA7zQ9H5=Zj6KQijm5CBXZc7J=it6C5gdEV0hb5Q@mail.gmail.com> <20181203181456.GK31738@dhcp22.suse.cz>
In-Reply-To: <20181203181456.GK31738@dhcp22.suse.cz>
From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon, 3 Dec 2018 10:19:55 -0800
Message-ID: <CAHk-=whrfDw4yV4h2ijbX3vpXf5m4hzJ5pGX7_v6pU31RGib-g@mail.gmail.com>
Subject: Re: [LKP] [mm] ac5b2c1891: vm-scalability.throughput -61.3% regression
To:     mhocko@kernel.org
Cc:     ying.huang@intel.com, Andrea Arcangeli <aarcange@redhat.com>,
        s.priebe@profihost.ag, mgorman@techsingularity.net,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        alex.williamson@redhat.com, lkp@01.org,
        David Rientjes <rientjes@google.com>, kirill@shutemov.name,
        Andrew Morton <akpm@linux-foundation.org>,
        zi.yan@cs.rutgers.edu, Vlastimil Babka <vbabka@suse.cz>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Dec 3, 2018 at 10:15 AM Michal Hocko <mhocko@kernel.org> wrote:
>
> The thing is that there is no universal win here. There are two
> different types of workloads and we cannot satisfy both.

Ok, if that's the case, then I'll just revert the commit.

Michal, our rules are very simple: we don't generate regressions. It's
better to have old reliable behavior than to start creating *new*
problems.

                 Linus